Table of Contents
Achieving precise dimensions in 3D printed parts is essential for functional and aesthetic purposes. Two common issues that affect dimensional accuracy are shrinkage and warping. Understanding how to calculate and compensate for these factors helps improve print quality and part fit.
Understanding Shrinkage
Shrinkage occurs when the material cools and contracts after extrusion. It can lead to parts being smaller than the intended dimensions. To account for this, measure the actual size of a test print and compare it to the original design.
The shrinkage percentage can be calculated using the formula:
Shrinkage (%) = [(Design Size – Actual Size) / Design Size] × 100
Understanding Warping
Warping is the deformation of the printed part, often at the edges, caused by uneven cooling. It results in parts that do not maintain their intended shape or dimensions. Warping is influenced by material properties and printing conditions.
To minimize warping, ensure proper bed adhesion, use heated beds, and optimize cooling settings. Measuring the extent of warping involves comparing the actual shape to the original CAD model.
Compensating for Dimensional Changes
Once the shrinkage percentage is known, adjust the design dimensions accordingly before printing. For example, if a part shrinks by 2%, increase the design size by the same percentage.
For warping, consider adding a margin or chamfer to the edges in the design to compensate for deformation. Additionally, printing test pieces helps refine these adjustments.
Summary
- Measure actual printed dimensions and compare to design.
- Calculate shrinkage percentage to adjust future designs.
- Implement proper printing settings to reduce warping.
- Use test prints to refine compensation strategies.